For Sale: Mavic Ellipse Wheelset

http://sheldonbrown.com/fixed.html#fixedmtb

Most flip-flop hubs are only threaded for a lockring on one side, but the sprocket/freewheel thread is the same, so you can screw a fixed sprocket onto the freewheel side. I'd put the smaller sprocket on the side without the lockring, because it's less likely to come unscrewed
Where's the bit that Sheldon Brown says it is ok to run without lockrings?